I want to submit the Copy of the Tax return 2015 and I do have the W2 forms but I cannot find the 1099 form, is that ok?

if a tax advisor prepared the form you may contact them. If the 1099 is central to sufficient income contact the payor for a copy.

Can I do two jobs as W2 exempt employee with two different employers with their respective valid H1Bs?

You may work for any or both H1B authorized employers.

What happens with multiple H1B transfers?

you may work for either employer until either employer withdraws their H1B petition.

What happens with Multiple H1B transfer petitions at same time?

you may work for employer 1 or employer 2 until either of them withdraw their petition.

SPONSOR I-864

you may sponsor a family member with social security benefits. the USCIS is expecting tax returns. other evidence of income may be provided.

What do I do.....When his priority date becomes current, do we change the application....or do I have to do something NOW....

His departure abandoned the benefits of the Life Act. When he left he became subject to a 3/10 year bar.

What is the difference in disruption of continuous residence between absences more than six months and more than one year?

An absence of more than 6 months, but less than a year creates assumption of abandoning one's permanent residence, but doesn't restart the...

No objection J waiver is approved, do I need to have I-612 approval notice from USCIS?

You will receive an I-612 from USCIS. Published processing time is about 9 months at this time.

Do you see any issues if I submit the new marriage certificate with my application

you should be able to submit the new marriage registration indicating the marriage date.

Job titles do not need to match for an H1B transfer. Still the job title should be in a specialty occupation which requires a specific degree.